GO TO U1002 (Gateway)
GO TO GATEWAY ECU COMMUNICATION STOP MODE
GO TO COMMUNICATION STOP MODE TABLE
GO TO DIAGNOSTIC TROUBLE CODE CHART
GO TO OPEN IN ONE SIDE OF CAN BRANCH LINE
CHECK RESULT OF COMMUNICATION MALFUNCTION CHECK (SELECT THE
(a) Inspect or repair the probable malfunctioning part based on the check result of step 5 (the step in
which checking for communication malfunction DTCs was performed).
Check Result of Communication Malfunction Check (Select Malfunctioning Bus):
The sub bus monitor ECU has not output communication DTCs but ECUs connected to the V bus
have stored communication DTCs.
(A malfunction occurred in the V Bus.)
The network gateway ECU (Gateway) outputs DTC U1002.
(A malfunction occurred in sub bus 2.)
The network gateway ECU outputs DTCs other than DTC U1002.
(A malfunction occurred in an ECU branch line connected to sub bus 2.)
he term "sub bus monitor ECU" refers to a gateway function equipped ECU that is able to monitor a bus
and store DTCs.
When checking for communication DTCs, refer to How to Interpret Communication DTCs (DTCs that start
with U) .
Because a gateway function equipped ECU (sub bus monitor ECU) monitors signals from all ECUs that are
connected to its sub bus, a gateway function equipped ECU can detect ECUs with a communication stop
more accurately. In this case, perform troubleshooting by referring to the DTC combination table for the
sub bus .
If communication DTCs are stored, and all ECUs and sensors connected to the CAN communication system
are displayed on the CAN Bus Check screen of the Techstream, a past malfunction that is currently not
occurring is suspected.
When a CAN branch of the V bus is malfunctioning, because the ECUs and sensors related to it detect the
malfunction, the problem area can be determined using the combination of DTCs that are output.
When sub bus 2 is malfunctioning, the network gateway ECU detects a communication stop for connected
ECUs and a network communication error, and stores DTCs.